Pump



Dec. 3, 1929. s, TELFER 1,737,870

- PUMP Filed June 5, 1924 I a H H BYQW QQ ATTORNEYS V Patented Dec. 3, 1929 v UNITED STATES ARCHIIBALD S. TELFER, OF TULSA, OKLAHOMA PUMP Application filed June 5,

This invention relates to improvements in pumps, one of the objects being to produce a simple, inexpensive and highly efiicient means for utilizing the pump pressure to prevent undesirable leakage of fluid at a stuffing box around the pump-operating member. More specifically stated, an object is to produce a device of this kind including a pressure conduit communicating with the discharge chamber of the pump and terminating in a nozzle to forcibly discharge the fluid at a high velocity, and certainother elements combined with the nozzle, as will be hereafter described, to effectively withdraw fluid from the stufiing box and return the same to the pumping element.

In the preferred form of the invention the discharge end of the nozzle is separated from a delivery conduit leading to the inlet chamher of the pump, and a housing connects the nozzle to the delivery conduit. A suction conduit, or drainage tube, extends from the stuffing box to said housing where it preferably terminates in a space between the nozzle and the inner face of the housing, so the fluid under pressure issuing from the nozzle withdraws fluid from the stufling box to said space, and then forcibly discharges the same into the delivery conduit which preferably leads to the inlet chamber of the amp. I

With the foregoing and other objects in view, the invention comprises the novel construction, combination and arrangement of parts hereinafter more specifically described and illustrated in the accompanying drawings, wherein is shown the preferred embodiment of the invention. However, it is to be understood that the invention comprehends changes. variations and modifications which come within the scope of the claim hereunto appended.

The drawing is a side elevation, partly in section, illustrating a pumpequipped with an attachment embodying the features of this invention.

As an illustration of a pumping device adapted for use with the invention, I have shown a centrifugal pump, although it will be understood that the invention can be used 1924. Serial N0. 718,138.

with any type of pump wherein it is desirable to prevent leakage from a stufling box, or the like, around the pump-operating shaft or rod. The pump herein shown comprises a casing 1 provided at its sides with stufling boxes 2 surrounding the operating member 3, and an impeller 4 carried by said operating member. The fluid to be pumped passes from an inlet chamber, or suction chamber, 5 to passageways 6 in the impeller 4, the latter being rotated with the operating member 3 to deliver the fluid by centrifugal force to a circumferential chamber 7 which may be termed the discharge chamber of the pump. I do not deem it necessary to show or describe numerous details of the pump, for it is suffieient to understand that the fluid under a relatively low pressure at the inlet chamber 5 is transmitted to the discharge chamber 7 where a relatively high pressure is maintained.

Each stuffing box 2 contains packing rings 8, a drainage ring 9 and an inlet ring 10, all held in position by agland 11. The rings 9 and 10 are H-shaped in cross section with the connecting web perforated as shown in the drawing.

The discharge chamber 7 is connected to the inlet chamber 5 by means of a conductor including a pressure conduit 13 leading from said discharge chamber and terminating in a nozzle 14, and a delivery conduit 15 leading to said inlet chamber 5, the discharge end of pressure conduit 13 being separated from the intake end of deliver-v conduit 15 to provide a space wherein the fluid under pressureis discharged from nozzle 14 to said conduit 15. The conductor also includes a unitary housing 16 surrounding said nozzle and connecting the separated conduits 13 and 15 to confine the fluid discharged across said space.

A suction conduit, or drainage conduit, 17 extends from the interior of the stuffing box to the interior of said housing 16. The in- 95 take end of suction conduit 17 is located at the perforated drainage ring 9 to receive the fluid entering said ring, and the outlet end of said conduit 17 is located at one side of the nozzle. This nozzle is separated from 109 fluid therethrough.

the inner face of housing 16 to provide a space for the admission of fluid from the suction conduit 17 to the interior of the housing. It will be noted that the unitary housing 16 has an opening at one end tightly fitting and firmly holding the nozzle, a restricted outlet at the opposite end for the discharge to the flaring delivery conduit 15, and an opening at one side for the admission of fluid from the suction conduit 17.

The fluid escaping through pressure conduit 13 is discharged at a high velocity from nozzle 14 to the delivery conduit 15, so as to create a suction or partial vacuum around the nozzle, and since the drainage conduit 17 terminates at one side of the nozzle, any fluid entering the drainage ring 9 will be effectively withdrawn through conduit 17 and then forced into the inlet chamber 5.

The pressure conduit 13 is preferably provided with a valve 18 to regulate the discharge of fluid therethrough.

To cool the bearing formed by the stuflin box and at the same time form a seal preventing the admission of air through the stufiing box, the pressure conduit 13 may be provided with a branch 19 leading to the ring 10 and having a valve 20 to regulate the flow to said ring. Some of the fluid passing from branch pipe 19 will flow to the interior of the pump casing, and some will flow to the drainage ring 9 and pass out through suction conduit 17.

Each stufling box may be equipped with a set of these conduits as shown at opposite sides of the drawing. The relatively large suction conduit 17 may extend downwardly from the stufling box, as shown at the left side of the drawing, and in this event gravity will aid in the drainage to housing 16. However, this is not essential, for the cooperating elements associated with the housing 16 are so combined with each other that I the fluid escaping to drainage ring 9 can be elevated through the suction conduit 17 at the right side of the drawing, and then forced through a prolongation 15' of the delivery conduit 15. The delivery conduit is relatively large to permit free delivery of I claim: I

In a device of the character described, an ejector comprising a unitary housing, a nozzle surrounded by said housing to discharge fluid under pressure therein, said unitary housing having an opening at one end tightly fitting and firmly holding said nozzle, a restricted discharge opening at the opposite end, a delivery conduit flaring from said discharge opening and an inlet at one side of the nozzle for the admission of fluid around said nozzle.

In testimony that I claim the foregoing I hereunto affix my signature.-

ARCHIBALD S. TELFER. 

